Heat exchanger for bathing shower

ABSTRACT

The present invention provides a heat exchanger for bathing shower comprising an upper deck, a lower chassis and two hatches. On the bottom surface of the upper deck are disposed several parallel septa, whose integral propping strength is good enough to support maximal body weight of a bathing user. After having assembled, the circulation of internal water passages is configured into a continual zigzag duct to increase energy saving effect in consequence of improvement in heat exchanging efficiency of the water heater. With simple structure, it is easily fabricated by traditional extruding method without welding process and related welding technician. Thereby, selling price is reduced with marketing competitiveness because overall manufacturing cost is decreased so that the purchasing intention of the consumers is spurred. Thus, it is not only favorable to promote and penetrate marketing range and depth but also valuable to achieve energy saving and carbon reducing effect.

FIELD OF THE PRESENT INVENTION

The present invention relates to a heat exchanger for bathing showerwith features in good heat exchanging efficiency, simple structure andeasy fabrication so that manufacturing cost is decreased and energysaving efficiency is increased. Thereby, the purchasing intention of theconsumers is spurred and energy saving and carbon reducing effects ispromoted.

BACKGROUND OF THE INVENTION

For the purpose of reducing carbon product, many heat exchangers forbathing shower used in household have been introducing in the market.The design concept is that the incoming cold tap water running throughin the heat exchanger is heated up by the bathed hot waste water, whichis served as thermal source, so that the temperature of output tap waterfrom heat exchanger becomes warmer than that of incoming tap water forbeing redirected into an inlet pipe for the water heater of bathingshower. Thereby, the temperature of the inlet water for the water heaterof bathing shower is increased to result in saving energy source forheating water. Taking China Patent for title “Water heater of energysaving type” in Number of CN201016505 at New Model invention publicizedon Feb. 6, 2008 as an example, as shown in FIGS. 1 through 3, the “Waterheater of energy saving type” comprises a water heater 10, whichincludes a water outlet pipe 12 and a shower sprayer 13, and a metalheat absorbing slab 20, which comprises a hollow chamber 21 with a topsurface 24, a water inlet pipe 23 and a water outlet pipe 22 such thatsaid hollow chamber 21, which allows cold tap water W1 flows therein,has one end thereof with water outlet pipe 22 connected to a waterintake 11 of the water heater 10 and the other end thereof with waterinlet pipe 23 connected to a source of cold tap water W1 (as shown inFIGS. 1 and 2). Upon a shower user M standing on the metal heatabsorbing slab 20 for starting shower, certain hot shower water W, whichcomes from the water heater 10 and flow through a water outlet pipe 12,will spray out of the shower sprayer 13. The hot shower water W willdrop on the flat top surface 24 of the metal heat absorbing slab 20after showering on the body of the shower user M, meanwhile certain coldtap water W1 will flow into the hollow chamber 21 of the metal heatabsorbing slab 20 via the water inlet pipe 23 and circulate among allhollow chamber 21 to absorb thermal energy of the dropped hot showerwater W on the top surface 24 of the metal heat absorbing slab 20 sothat the cold tap water W1 becomes warm heat-exchanged water W2. Thewarm heat-exchanged water W2 then flows out of the water outlet pipe 22of the metal heat absorbing slab 20 to flow into the water heater 10orderly via the water outlet pipe 22 and the water intake 11 thereof forserving as warm feeding water (as shown in FIG. 2). Thereby, the energysaving effect for electricity of gas consumption of the water heater 10is achieved.

Please refer to FIGS. 4 and 5 that show another exemplary embodiment forthe water heater 10 of a metal heat absorbing slab 200. The metal heatabsorbing slab 200 comprises a spiral metal tube 201, which isconfigured into planar serpent disk through multiple metal workingprocess. The spiral metal tube 201 has multiple continual coils with agap S for each pair of adjacent coils, one end thereof with water outletpipe 22 connected to a water intake 11 of the water heater 10 and theother end thereof with water inlet pipe 23 connected to a source of coldtap water W1. By heat exchanging means of the spiral metal tube 201between (hot shower water W) dropped on the top surface of the metalheat absorbing slab 200 and cold tap water W1 will flow into the spiralmetal tube 201 of the metal heat absorbing slab 200, the cold tap waterW1 flowed in the spiral metal tube 201 becomes warm heat-exchanged waterW2. The warm heat-exchanged water W2 then flows out of the water outletpipe 22 of the metal heat absorbing slab 200 to flow into the waterheater 10 orderly via the water outlet pipe 22 and the water intake 11thereof for serving as warm feeding water. Thereby, the energy savingeffect for electricity of gas consumption of the water heater 10 isachieved.

However, some drawbacks still exist in the China Patent for title “Waterheater of energy saving type” in Number of CN201016505 at New Modelinvention as following:

1. Please refer to FIGS. 1 through 3 for metal heat absorbing slab 20.In order to keep the hot shower water W drop on the top surface 24 ofthe metal heat absorbing slab 20, the shower user M must stand on thetop surface 24 of the metal heat absorbing slab 20. Consequently, themetal top surface 24 with hollow chamber 21 beneath will be indenteddeformation owing to body weight strain of the shower user M for longterm use (as hypothetical line shown in FIG. 3). Because metal heatabsorbing slab 20 is fabricated by metal welding process, water leakageis incurred from certain metal welding seams on the metal heat absorbingslab 20 being fractured due to indented deformation thereon so that notonly the heat exchanging effect will be lost but also certain fracturedmetal welding seams may cause accidental hurt to the shower user Minadvertently. Moreover, because no circulation directing means isdesigned in the hollow chamber 21, water turbulences will happen in thechamber 21 after cold tap water W1 flows into therein via the waterinlet pipe 23 (as indicting arrow heads shown in FIG. 2) so that theenergy saving effect will be considerably decreased in consequence oflowering heat exchanging efficiency.

2. Please refer to FIGS. 4 and 5 for metal heat absorbing slab 200.Likewise, in order to keep the hot shower water W drop on the topsurface of the metal heat absorbing slab 200, the shower user M muststand on the top surface of the metal heat absorbing slab 200. Becausemetal heat absorbing slab 200 is formed by spiral metal tube 201 havingmultiple continual coils with a gap S for each pair of adjacent coils,the round top surface thereof becomes slippery once hot shower water Wdrops thereon so that the shower user M stands thereon often sufferedfrom injure inadvertently incurred by falling down due to such roundslippery surface (as shown in FIG. 4). That is a menace to the safety ofthe shower user M. Moreover, all the gaps S between each pair ofadjacent coils in the spiral metal tube 201 cause no heat exchangingfunction as the hot shower water W passes therein without contacting tothe spiral metal tube 201 (as shown in FIG. 5) so that the energy savingeffect will be considerably decreased in consequence of lowering heatexchanging efficiency.

3. The key process for the manufacturing of metal heat absorbing slab 20in FIG. 1 and metal heat absorbing slab 200 in FIG. 4 is metal weldingprocess, which cause relative high labor cost in manufacturing expenseas metal welding process is often worked by high-skilled technician withhigh salary to maintain high yield. Moreover, the multiple continualcoils with a gap S for each pair of adjacent coils for fabricating thespiral metal tube 201 must processed by a tube-bending machine of highaccuracy together with metal welding process for welding connection withwater inlet pipe 23 and water outlet pipe 22 respectively so thatoverall manufacturing cost keep soaring high without possibility oflowering down. Thus, the ex-factory price and retail price for theproduct of metal heat absorbing slab 20 and 200 become particular highwith difficulty for lowering down so that not only the purchasingintention of the consumer is retarded but also the product itselfbecomes unpopular.

Therefore, how to contrive an improved product of heat exchanger forbathing shower with simplified structure and relative low manufacturingcost to satisfy with the purchasing ability and intention of customersseem very critical.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a heatexchanger for bathing shower with following features: (1) integralpropping strength is good enough to support maximal body weight of abathing user; (2) the circulation of internal water passages isconfigured into continual zigzag duct to considerably increase energysaving effect in consequence of improvement in heat exchangingefficiency of the bathing water heater; (3) simple structure and easyfabrication by traditional extruding method without involving weldingprocess and related high-salary welding technician. Thereby, sellingprice can be substantially reduced with strong marketing competitivenessbecause overall manufacturing cost is decreased without sacrificequality so that the purchasing intention of the consumers is spurred.Thus, the present invention is not only favorable to promote andpenetrate marketing range and depth but also valuable to expedite inachieving the eco-friend effect of energy saving and carbon reducingrequirement.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the first structural schematic view for the conventional heatexchanger of China Patent in No. CN201016505.

FIG. 2 is a sectional view taken along line 2-2 as indicated in FIG. 1.

FIG. 3 is an operational schematic view for the conventional heatexchanger of China Patent in No. CN201016505.

FIG. 4 is the second structural schematic view for the conventional heatexchanger of China Patent in No. CN201016505.

FIG. 5 is the third structural schematic view for the conventional heatexchanger of China Patent in No. CN201016505.

FIG. 6 is an exploded perspective view of a heat exchanger for bathingshower according to a first preferred embodiment of the presentinvention.

FIG. 7 is a perspective schematic view showing an upper deck underdrilling bores process by a drilling tool for the above first preferredembodiment of the present invention.

FIG. 8 is a perspective schematic view showing an upper deck for theabove first preferred embodiment of the present invention.

FIG. 9 is the first perspective schematic view showing assemblingprocess for the above first preferred embodiment of the presentinvention.

FIG. 10 is the second perspective schematic view showing assemblingprocess for the above first preferred embodiment of the presentinvention.

FIG. 11 is the third perspective schematic view showing assemblingprocess for the above first preferred embodiment of the presentinvention.

FIG. 12 is a sectional view taken along line 12-12 as indicated in FIG.11.

FIG. 13 is a sectional view taken along line 13-13 as indicated in FIG.11.

FIG. 14 is an installed schematic view showing practical usage for theabove first preferred embodiment of the present invention.

FIG. 15 is a sectional view taken along line 15-15 as indicated in FIG.14.

FIG. 16 is a illustrative schematic view showing extruding process forthe above first preferred embodiment of the present invention.

FIG. 17 is a perspective schematic view showing an upper deck underfraise process by milling cutter for the above first preferredembodiment of the present invention.

FIG. 18 is a perspective schematic view showing an upper deck after deckfraise process by milling cutter for the above first preferredembodiment of the present invention.

FIG. 19 is an exploded perspective view for the second preferredembodiment of the present invention.

FIG. 20 is an assembly schematic view for the second preferredembodiment of the present invention.

FIG. 21 is an exploded perspective view for the third preferredembodiment of the present invention.

FIG. 22 is an assembly schematic view for the third preferred embodimentof the present invention.

FIG. 23 is an exploded schematic view for the fourth preferredembodiment of the present invention.

FIG. 24 is an assembly schematic view for the fourth preferredembodiment of the present invention.

FIG. 25 is an assembly schematic view for the fifth preferred embodimentof the present invention.

FIG. 26 is an operational schematic view for the fifth preferredembodiment of the present invention.

FIG. 27 is an exploded perspective view for the sixth preferredembodiment of the present invention.

FIG. 28 is an assembly perspective view for the sixth preferredembodiment of the present invention.

FIG. 29 is a sectional view taken along line 29-29 as indicated in FIG.28. FIG. 30 is a sectional view taken along line 30-30 as indicated inFIG. 28.

FIG. 31 is a sectional view taken along line 31-31 as indicated in FIG.28.

FIG. 32 is a perspective schematic view for the seventh preferredembodiment of the present invention.

FIG. 33 is an exploded sectional view for the seventh preferredembodiment of the present invention.

FIG. 34 is an assembly sectional view for the seventh preferredembodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 6 through 13, a heat exchanger for bathing showeraccording to a first preferred embodiment of the present inventioncomprises a stacked upper deck 30, a founded lower chassis 40 and twohatches 50.

Referring to FIGS. 6 through 13, the upper deck 30 is a planiform cuboidextruded by metal material and encompassed by a top surface 31, a bottomsurface 32, a front side 33, a rear side 34, a pair of parallel flanks35, includes a plurality of screw bores 36 created in the front side 33and rear side 34 respectively, several parallel septa 37 downwardlydisposed on the bottom surface 32 such that a water passage 303 iscreated between each pair of adjacent septa 37, an upper docking latchbar 38 in male dovetail cross section being downwardly formed on theterminal of one septum 37, a circulating bore 39 being created on eachseptum 37 in interlaced stagger manner, which means a circulating bore39 in upper section of one septum 37 and another circulating bore 39 inlower section of the other septum 37 for each pair of adjacent septa 37,so that all the adjacent water passages 303 can be mutually communicableas a continual zigzag circulating duct even being separated by a septum37 between them, a water intake 301 is created in one flank 35 while awater outtake 302 is created in the other opposed flank 35 respectively;

The lower chassis 40 is a planiform slab extruded by metal material andencompassed by a top surface 41, a sole surface 42, a front side 43, arear side 44, a pair of parallel flanks 45 with same planar shape andarea with corresponding upper deck 30, includes a plurality of screwbores 47 created in the front side 43 and rear side 44 respectively, anda lower docking latch bar 46 in female dovetail cross section, which isupwardly formed on the top surface 41 in a suitable positioncorresponding to the upper docking latch bar 38 of the specific septum37 on the upper deck 30 so that the male dovetailed upper docking latchbar 38 and the corresponding female dovetailed lower docking latch bar46 can be securely engaged in mutual latch manner; and

The each hatch 50 is a planiform slab with suitable planar shape andarea to properly cover an interim integral assembly of the upper deck 30and lower chassis 40 in flush manner, has a plurality of punched holes51 disposed thereon in corresponding to the screw bores 36 on the upperdeck 30 or screw bores 47 on the lower chassis 40 so that both of frontand rear hatches 50 can hermetically seal both front sides 43 and 44 aswell as both rear sides 34 and 44 of the interim integral assembly ofthe upper deck 30 and lower chassis 40 in plenum manner including allwater passages 303 of continual zigzag circulating duct with septa 37therein (as shown in FIG. 12).

Referring to FIGS. 9 through 11, the assembling process is described asbelow.

Firstly, align and insert the male dovetailed upper docking latch bar 38on the upper deck 30 into the female dovetailed lower docking latch bar46 on the lower chassis 40 (as shown in FIG. 9);

Secondly, simultaneously apply forces on both of the rear side 34 on theupper deck 30 and the front side 43 on the lower chassis 40 in opposedinward manner to dock both of the upper deck 30 and lower chassis 40 upto flush manner so that a interim integral assembly of the upper deck 30and lower chassis 40 is assembled (as shown in FIG. 10); and

Finally, cover both of front and rear hatches 50 on both front sides 43and 44 as well as both rear sides 34 and 44 of the interim integralassembly of the upper deck 30 and lower chassis 40, then drive (screwsN) in the punched holes 51 on the upper deck 30 through the punchedholes 51 on the lower chassis 40 to securely fix the interim integralassembly of the upper deck 30 and lower chassis 40 into a final plenum(as shown in FIG. 11).

For all foregoing assembling process, only few three simple steps arerequired without involving any welding process and related weldingtechnician so that manufacturing cost is substantially reduced owing tolow human labor and labor hour.

Please refer to FIGS. 14 and 15. The installation and operation methodsfor a heat exchanger for bathing shower of the present invention aredescribed as below. By means of proper pipe fittings, connect a waterinlet pipe 23 of tap water to the water intake 301 on the upper deck 30while connect a water outlet pipe 22 in water intake 11 of a waterheater 10 to the water outtake 302 on the same upper deck 30 to finishthe installation before operation (as shown in FIG. 14). For shower,firstly, upon a shower user M starting shower, certain hot shower waterW, which comes from the water heater 10 and flow through a water outletpipe 12, will spray out of the shower sprayer 13; secondly, the hotshower water W will drop on the flat top surface 31 of the upper deck 30after shower on the body of the shower user M, meanwhile certain coldtap water W1 will flow into the water passages 303 of the upper deck 30orderly via the water inlet pipe 23 and the water intake 301 of theupper deck 30, then circulate among all water passages 303 by means ofevery circulating bore 39 on each septum 37 (as indicated by arrowheadshown in FIG. 15) to absorb thermal energy of the dropped hot showerwater W on the top surface 31 of the upper deck 30 so that the cold tapwater W1 becomes warm heat-exchanged water W2; and finally, the warmheat-exchanged water W2 then flows out of the water outtake 302 on theupper deck 30; and then flows into the water heater 10 orderly via thewater outlet pipe 22 and the water intake 11 thereof for serving as warmfeeding water (as shown in FIG. 14). Thereby, the energy saving effectfor electricity of gas consumption of the water heater 10 is achieved.

It is known from FIGS. 14 and 15 that the plural septa 37 in each pairadjacent water passages 303 formed between the bottom surface 32 of theupper deck 30 and the upper surface 41 of the lower chassis 40 alsoserve as props (as indicated by enlarged view shown in FIG. 14), whichis strong enough to completely support normal body weight of a showeruser M so that not only the service life span of the integral plenum ofthe upper deck 30 and lower chassis 40 can be extended due to noindented deformation being able to happen thereon, but also the showeruser M suffered from injure inadvertently incurred by falling down canbe avoided because the flat top surface 31 on the upper deck 30 offersstable platform for shower user M to stand thereon (as shown in FIG. 14and indicated by enlarged view associated). Moreover, the circulatingbore 39, which is created on each septum 37 to make every pair adjacentwater passages 303 become water communicable mutually, serves as acirculation directing means in the heat exchanging slab 30 (as indicatedby arrowhead shown in FIG. 15) for directing the cold tap water W1 tobecome a smoothly regular path-oriented stable flow in the waterpassages 303 between the upper deck 30 and lower chassis 40 so that theheat exchanging efficiency of the present invention is improved and theenergy saving effect of the water heater 10 is substantially increased.

All the foregoing upper deck 30 and lower chassis 40 of the presentinvention are produced by traditional extruding method. Referring toFIG. 16, take fabrication of the upper deck 30 as an example. Firstly,melt raw material of aluminum alloy by an extruder A, then extrude itout as a continual upper deck slab 300 via an extruding die B; secondly,cut the continual upper deck slab 300 into piece form of desired lengthby a cutting tool C, and finally, drill all circulating bores 39 by adrilling tool D (as indicated by hypothetical lines shown in FIG. 7),and then a finished upper deck 30 is produced. The fabrication of thelower chassis 40 can be done in the same way as well. For all foregoingfabricating process, only few traditional techniques and related toolsare required without involving any complicated process and relatedexpensive machinery so that manufacturing cost is substantially reducedbecause fabricating process can be done in mass production of continuousproduction line with low human labor and labor hour.

Please refer to FIGS. 17 and 18, which show an upper deck under fraiseprocess by milling cutter for the first exemplary embodiment of thepresent invention. The foregoing drilling process in creatingcirculating bores 39 by a drilling tool D can be adapted by replacing amilling cutter G for the drilling tool to cut out equivalent circulatingnotches 391 in indented manner, which still function as circulatingbores 39 (as shown in FIG. 17).

Comparing to conventional fabricating process, which involves weldingprocess and related welding technician, the fabricating process of thepresent invention only with drilling tool D in creating circulatingbores 39 or milling cutter G in creating circulating notches 391eliminating welding process is apparently much simpler. Thereby, themarketing competitiveness of the present invention can be considerablyenhanced in consequence of the manufacturing cost being substantiallyreduced from low human labor and labor hour. Thus, to promote energysaving campaign in recycling hot shower water W for the water heater 10,the present invention can play an important role for immediateeffectiveness.

Referring to FIGS. 19 and 20, they show the second exemplary embodimentof the present invention. Wherein, the upper deck 30 is further modifiedto dispose a male dovetailed inward flank latch bar 351 on each flank 35thereof while the lower chassis 40 is further modified to dispose acorresponding female dovetailed outward flank latch bar 451 on eachsuitable marginal position of upper surface 41 thereof (as shown in FIG.19). By means of additional engagement from the pair of male dovetailedinward flank latch bar 351 and the corresponding female dovetailedoutward flank latch bar 451, the interim integral assembly of the upperdeck 30 and lower chassis 40 can be securely docked in much bettermanner (as shown in FIG. 20).

Referring to FIGS. 21 and 22, they show the third exemplary embodimentof the present invention. Wherein, the upper deck 30 is further modifiedto dispose a male dovetailed upper docking latch bar 38 on every septa37 on the bottom surface 32 thereof while the lower chassis 40 isfurther modified to dispose a corresponding equivalent number of femaledovetailed lower docking latch bars 46 on each suitable marginalposition of upper surface 41 thereof such that each lower docking latchbars 46 is in corresponding to a matched upper docking latch bar 38 (asshown in FIG. 21). By means of additional engagement from all maledovetailed upper docking latch bars 38 and the corresponding femaledovetailed lower docking latch bars 46, the interim integral assembly ofthe upper deck 30 and lower chassis 40 can be securely docked in muchbetter manner (as shown in FIG. 22).

Referring to FIGS. 23 and 24, they show the fourth exemplary embodimentof the present invention. Wherein, the original male dovetailed upperdocking latch bar 38 on the upper deck 30 is modified into a femaledovetailed upper docking latch bar 38 while original female dovetailedlower docking latch bar 46 on the lower chassis 40 is modified into acorresponding male dovetailed lower docking latch bar 46 (as shown inFIG. 23). By means of engagement from the new pair of female dovetailedupper docking latch bar 38 and the corresponding male dovetailed lowerdocking latch bar 46, the interim integral assembly of the upper deck 30and lower chassis 40 can be securely docked in same effect as thatengagement from the original pair of male dovetailed upper docking latchbar 38 and the corresponding female dovetailed lower docking latch bar46 (as indicated by enlarged view shown in FIG. 24).

Referring to FIGS. 25 and 26, they show the fifth exemplary embodimentof the present invention. Wherein, the top surface 31 on the upper deck30 is modified into a cambered top surface 31 (as shown in FIG. 25) tofacilitate the sprinkled hot shower water W to easily drain out withoutand accumulation on the cambered top surface 31 of the upper deck 30 sothat heat exchanging effect is not reduced due to cooling effect of theaccumulated hot shower water W thereon (as shown in FIG. 26).

Referring to FIGS. 27 through 31, they show the sixth exemplaryembodiment of the present invention. Wherein, each internal hatch face501 of the front hatch and rear hatch 500 is modified to inwardly createan array of terminal linking passages 502 of zigzag end therein toreplace the function of the circulating bores 39 or circulating notches391 (as shown in FIG. 27). The assembling process for this sixthexemplary embodiment is shown in FIGS. 27 through 31, which is almostthe same as that shown in FIGS. 9 through 11. After having securelyengaged the integral assembly of the upper deck 30 and lower chassis 40as well as modified hatches 500 by screws N, a configuration of zigzagcirculation from combination of water passages 303 and terminal linkingpassages 502 is finished (as shown in FIG. 29). By means of the terminallinking passages 502, the fabricating process of the circulating bores39 or circulating notches 391 can be obliterated to reduce manufacturingcost.

Referring to FIGS. 32 through 34, they show the seventh exemplaryembodiment of the present invention. Wherein, the upper deck 30 ismodified to split into a primary upper deck 30 a and an annexedsubordinate upper deck 30 b while the lower chassis 40 is also splitinto a corresponding primary one and a subordinate one (as shown in FIG.32) such that an additional recessed linking elbow bar 352 is disposedon a flank 35 a of the primary upper deck 30 a while an additionalcorresponding projected linking elbow bar 353 is disposed on a flank 35b of the annexed subordinate upper deck 30 b. Moreover, a plurality ofscrew bores 354 are formed in the recessed linking elbow bar 352 while aplurality of punched holes 355 are perforated in the projected linkingelbow bar 353 (as shown in FIG. 33). By driving a screw N through eachpunched hole 355 and screwing with each corresponding screw bore 354,the primary upper deck 30 a and annexed subordinate upper deck 30 b canbe mutually engaged securely so that the covering area of the presentinvention can be enhanced with more flexibility to meet some specificrequirement of irregularly expanded floor layout of the bathing room (asshown in FIGS. 32 and 34). Preferably but not necessarily, the primaryupper deck 30 a is identical to the upper deck 30 while the width of theannexed subordinate upper deck 30 b is less than that of the upper deck30.

The metal material used in the upper deck 30 of the present inventioncan be replaced by a non-metal synthetic material with good heatconductivity such as carbon fiber, which also has the same heatexchanging effect for hot shower water W in energy-saving function ofthe water heater 10 as that of the metal material. In conclusion all thedisclosure heretofore, the simple structure with less fabricatingprocess of the present can definitely reduce the manufacturing costother than considerably energy-saving effect for the bathing waterheater. Thus, it meets the basic criterion of patentability.

1. A heat exchanger for bathing shower, comprising: a stacked upperdeck; a founded lower chassis ; and two hatches, wherein said upper deckis a planiform cuboid extruded by metal material and encompassed by atop surface, a bottom surface, a front side, a rear side, a pair ofparallel flanks, includes several parallel septa downwardly disposed onthe bottom surface such that a water passage is created between eachpair of adjacent septa, an upper docking latch bar being downwardlyformed on the terminal of one septum, a circulating bore being createdon each septum in interlaced stagger manner, which means a circulatingbore in upper section of one septum and another circulating bore inlower section of the other septum for each pair of adjacent septa, awater intake is created in one flank while a water outtake is created inthe other opposed flank respectively, wherein said lower chassis is aplaniform slab extruded by metal material and encompassed by a topsurface, a sole surface, a front side, a rear side, a pair of parallelflanks with same planar shape and area with corresponding upper deck,includes a lower docking latch bar, which is upwardly formed on the topsurface in a suitable position corresponding to the upper docking latchbar of the specific septum on the upper deck so that the upper dockinglatch bar and the corresponding lower docking latch bar can be securelyengaged in mutual latch manner, and wherein said each hatch is aplaniform slab with suitable planar shape and area to properly cover aninterim integral assembly of the upper deck and lower chassis in flushmaimer, includes all water passages of continual zigzag circulating ductwith septa in the interim integral assembly of the upper deck and lowerchassis.
 2. A heat exchanger for bathing shower as claimed in claim 1,wherein a plurality of screw bores are further respectively created inthe front side and rear side for the upper deck and the lower chassis,and an equivalent number of plural corresponding punched holes are alsodisposed on both of front and rear hatches in corresponding to the screwbores on the upper deck or screw bores on the lower chassis so that bothof front and rear hatches can hermetically seal both front sides as wellas both rear sides of the interim integral assembly of the upper deckand lower chassis in plenum manner.
 3. A heat exchanger for bathingshower as claimed in claim 1, said upper deck is further modified todispose an inward flank latch bar on each flank thereof while said lowerchassis is further modified to dispose a corresponding outward flanklatch bar on each suitable marginal position of upper surface thereof.4. A heat exchanger for bathing shower as claimed in claim 1, said upperdeck is further modified to dispose a upper docking latch bar on everysepta on the bottom surface thereof while said lower chassis is furthermodified to dispose a corresponding equivalent number of lower dockinglatch bars on each suitable marginal position of upper surface thereof.5. A heat exchanger for bathing shower as claimed in claim 1, whereinsaid upper docking latch bar is male dovetailed cross section while saidlower docking latch bar is female dovetailed cross section.
 6. A heatexchanger for bathing shower as claimed in claim 4, wherein said upperdocking latch bar is male dovetailed cross section while said lowerdocking latch bar is female dovetailed cross section.
 7. A heatexchanger for bathing shower as claimed in claim 3, wherein said inwardflank latch bar on the upper deck is male dovetailed cross section whilesaid outward flank latch bar in the lower chassis is female dovetailedcross section, and vice versa.
 8. A heat exchanger for bathing shower asclaimed in claim 1, wherein said top surface on the upper deck ismodified into a cambered top surface.
 9. A heat exchanger for bathingshower as claimed in claim 1, wherein the metal material used in saidupper deck is replaced by a non-metal synthetic material with good heatconductivity.
 10. A heat exchanger for bathing shower as claimed inclaim 1, wherein said upper deck is modified to split into a primaryupper deck and an annexed subordinate upper deck while the lower chassisis also split into a corresponding primary one and a subordinate onesuch that an additional recessed linking elbow bar is disposed on aflank of the primary upper deck while an additional correspondingprojected linking elbow bar is disposed on a flank of the annexedsubordinate upper deck, as well as a plurality of screw bores are formedin the recessed linking elbow bar while a plurality of punched holes areperforated in the projected linking elbow bar.
 11. A heat exchanger forbathing shower as claimed in claim 1, wherein each internal hatch faceof said front hatch and rear hatch is modified to inwardly create anarray of terminal linking passages of zigzag end therein to replace thefunction of the circulating bores or circulating notches; after havingsecurely engaged the integral assembly of the upper deck and lowerchassis as well as modified hatches by screws, a configuration of zigzagcirculation from combination of water passages and terminal linkingpassages is finished.
 12. A heat exchanger for bathing shower as claimedin claim 1, wherein said circulating bores created on every septa of theupper deck in interlaced stagger manner are replaced by equivalentcirculating notches cut out in indented manner.